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Active DNA unwinding dynamics during processive DNA replication

AutorMorín, José Antonio; Cao, Francisco J.; Lázaro, José M. ; Arias-González, J. R.; Valpuesta, José M.; Carrascosa, José L.; Salas, Margarita ; Ibarra, Borja
Palabras claveMolecular motors
Single-molecule
Strad displacement
Replicative DNA plymerase
Fecha de publicación2012
EditorNational Academy of Sciences (U.S.)
CitaciónPROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 109: 8115- 8120 (2012)
ResumenDuplication of double-stranded DNA (dsDNA) requires a fine-tuned coordination between the DNA replication and unwinding reactions. Using optical tweezers, we probed the coupling dynamics between these two activities when they are simultaneously carried out by individual Phi29 DNA polymerase molecules replicating a dsDNA hairpin. We used the wild-type and an unwinding deficient polymerase variant and found that mechanical tension applied on the DNA and the DNA sequence modulate in different ways the replication, unwinding rates, and pause kinetics of each polymerase. However, incorporation of pause kinetics in a model to quantify the unwinding reaction reveals that both polymerases destabilize the fork with the same active mechanism and offers insights into the topological strategies that could be used by the Phi29 DNA polymerase and other DNA replication systems to couple unwinding and replication reactions.
URIhttp://hdl.handle.net/10261/111105
DOI10.1073/pnas.1204759109
Identificadoresdoi: 10.1073/pnas.1204759109
issn: 0027-8424
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